On Mon, Jun 29, 2026 at 5:57 AM Tina Zhang <[email protected]> wrote: > > The SVM DecodeAssists feature is reported in CPUID > Fn8000_000A_EDX[7]. When available, hardware provides the length and bytes > of the intercepted instruction in the VMCB, allowing a hypervisor to consume > the decode information directly instead of re-decoding the instruction in > software on relevant VM-Exit paths.
DecodeAssists actually comprises four components: * GPR number in EXITINFO1 for MOV-CR and MOV-DR VM-exits * Software interrupt number in EXITINFO1 for INTn VM-exits * Linear address in EXITINFO1 for INVLPG[A] VM-exits * Guest instruction bytes and length in the VMCB for #NPF and #PF VM-exits You only partially address the last component.
